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Pork/lard is inherently unhealthy and contains "lard factor", a form of Poison/"Vitamin A" activity

If there was ever one of those "old wives' tales" aka "ancient urban legends" that I have found to be true, it's that eating pig is NOT good for anyone.  Now, I'm starting to figure out the "why" behind that.

First, there is a great 3-part article on pork and how the RESEARCH shows that the more pork one eats, the unhealthier they are (cirrhosis of the liver, liver cancer, and multiple sclerosis are particularly associated with more pork/lard consumption):

What if I were to tell you that lard has been shown to induce hypothyroidism and actually damage the thyroid in rats?

Dietary high-fat lard intake induces thyroid dysfunction and abnormal morphology in rats

Conclusion: Dietary high-fat lard intake induces significant thyroid dysfunction and abnormal morphology in rats, which can not be corrected by short-term dietary modification.

The impact of high fat diets on physiological changes in euthyroid and thyroid altered rats

There were significant differences (P < 0.05) in the control group and the 25% lard group across the euthyroid and thyroid altered animals from the remainder of the experimental groups. The higher values may be attributed to feedback loop inhibition in which the hormone was not being utilized []. Damage to thyroid glands was confirmed through histopathological evaluation (data not shown).

Lard also causes inflammation and insulin resistance in rats (maybe you already know that these are major issues today in general?):

Differential effects of high-fat-diet rich in lard oil or soybean oil on osteopontin expression and inflammation of adipose tissue in diet-induced obese rats.

Obese rats continuously fed high-fat diet rich in lard oil exhibited the highest fasting serum insulin level and adipose tissue OPN, F4/80, TNF-α, and NF-κB expression level.
[...]
CONCLUSIONS: Reducing diet fat or replacing lard oil with soybean oil in high-fat diet alleviates obesity-related inflammation and insulin resistance by attenuating the upregulation of OPN and macrophage infiltration into adipose tissue induced by high-fat diet.

A lard-based high-fat diet in rat pregnancy caused all sorts of problems in their offspring...maybe you'll recognize these things in the younger generations of today:

Maternal high-fat diet induces obesity and adrenal and thyroid dysfunction in male rat offspring at weaning

Female Wistar rats were fed a normal (9% fat; C group) or high-fat diet (29% fat as lard; HF group) for 8 weeks before mating and during pregnancy and lactation.
[...]
In the present study, we demonstrate for the first time that a perinatal maternal high-fat diet, through changes in milk composition, has short-term consequences, such as increased adrenal medullary and thyroid function, higher adiposity, hyperleptinaemia, and hyperglycaemia in the offspring. These changes occur even with a normal maternal caloric intake and may contribute, as priming factors, to the development of metabolic and cardiovascular diseases.

Translation...the offspring of the high-lard diet mother rats had adrenal problems, thyroid problems, were fatter, had higher leptin levels, and had higher blood sugar levels.  Where have you seen all these things before?  The scourges of modern society, perhaps?

It should be noted that ALL those problems above happened at NORMAL CALORIC INTAKE, the main difference was that there was a lot of LARD in the diet.  This means the "calories in, calories out" idea was NOT TRUE here!

How does this tie into Poison/"Vitamin A"?  What if I were to tell you that there is something called "lard factor" that has been shown to have significant Poison/"Vitamin A" activity?

An unknown factor with vitamin A activity distilled from lard. (1950)

Relation of vitamin A and "lard factor" to disease caused by rancid lard. (1950)

Studies in vitamin A. 26. The vitamin A-replacing effect of lard (1953)

Nature of the vitamin A-like factor in lard. (1953)

VITAMIN A activity of lard.

Identification of the so-called "lard factor" as vitamin A. (1954)

In more recent times, lard factor has been distinctly regarded as a synonym for retinol.

NIH PubChem Open Chemistry Database - Retinol

3.4.2 Depositor-Supplied Synonyms

1. Retinol
[...]
36. Lard Factor

Eating pig is not healthy.  There is an abundance of history and science telling us this.

After all that, how could I not include this NSFW (language) clip from Pulp Fiction?

Dr. Garrett Smith, the "Nutrition Detective"
Licensed Naturopathic Physician (NMD) in Arizona
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